get '500 Internal Server Error undefined: Could not load servlet' after Submit

does anyone would help me out what's wrong with my coding? I m jsp newbie, I have got '500 Internal Server Error undefined: Could not load servlet' after SUBMIT. I don't know the exactly problem on my script or... please help. Thanks! any comments would appreciate.

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We will be discussing what Azure Stack is, how does it fit into the suit of offerings that Azure has currently, and where can it fit into your organizations technology stack. We will also be discussing limitations of the platform while covering various applicable scenarios.

Invalid UTF-8 code. (byte: 0xffffffa4)
at com.ibm.xml.framework.XMLParser.handleError(XMLParser.java) at
com.ibm.xml.framework.XMLParser.error1(XMLParser.java) at
com.ibm.xml.internal.UTF8CharReader.handleMultiByteChar(UTF8CharReader.java) at
com.ibm.xml.internal.UTF8CharReader.copyNormalize(Compiled Code) at
com.ibm.xml.internal.UTF8CharReader.fillCurrentChunk(Compiled Code) at
com.ibm.xml.internal.UTF8CharReader.<init>(UTF8CharReader.java) at
com.ibm.xml.internal.UTF8Recognizer.recognize(UTF8Recognizer.java) at
com.ibm.xml.internal.DefaultEntityHandler.callRecognizers(Compiled Code) at
com.ibm.xml.internal.DefaultEntityHandler.createReader(DefaultEntityHandler.java) at
com.ibm.xml.internal.DefaultScanner.scanDocument(Compiled Code) at
com.ibm.xml.framework.XMLParser.parse(XMLParser.java) at
com.jclark.xsl.sax.XMLProcessorImpl.load(XMLProcessorImpl.java) at
com.jclark.xsl.sax.XSLProcessorImpl.parse(XSLProcessorImpl.java) at
com.livesoftware.xml.XT.process(XT.java:66) at
com.livesoftware.jsp.JSPCompiler.createServlet(JSPCompiler.java:111) at
com.livesoftware.jsp.JSPServlet.service(JSPServlet.java:95) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:840) at
com.livesoftware.jrun.JRun.runServlet(Compiled Code) at
com.livesoftware.jrun.JRunGeneric.handleConnection(JRunGeneric.java) at
com.livesoftware.jrun.JRunGeneric.handleProxyConnection(JRunGeneric.java) at
com.livesoftware.jrun.service.proxy.JRunProxyServiceHandler.handleRequest(JRunProxyServiceHandle
r.java) at com.livesoftware.jrun.service.ThreadConfigHandler.run(Compiled Code)

Listen the only way is to get me the log, or better,
do the following,
(it is a guaranteed way to work):

1) remove the JSript part completely from the JSP (if it works, then the parser was stupid enough to understand the JScript) and the problem was in the parser not understanding the JScript '<' operator.

2) strip the functionality here & there, compiling at each step...
if it works...

3) add the following to get better error message (use it in debug version) since not ALL JSP engines report errors to the browser correctly... (but they always log it inside their error log)

I really thanks for your kind help. I would try what u told me. but after that, if there is still an error on that jsp file. did u need the source code of java files for u to compile? I can send it to u by email later when u need it.

p.s. u will get all the points & i will increase it soon.

Hope I can figure it out what is wrong. i think I need a few days to do that.

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